(GREAT BARRINGTON, Mass.) – The 19th century will rub shoulders with the late 20th on Saturday, April 20, 2013, at 6pm at the Mahaiwe Performing Arts Center when the Close Encounters With Music chamber series features back-to-back piano trios by Franz Schubert and Paul Schoenfield, performed by pianist Jeffrey Swann, violinist Erin Keefe, and series…